[sdiy] You all missed my arp omni chronicles..

[harrybissell]

I use the NJR4558  (JRC) and have not noticed the issue. I'll have to
check the data sheet, they do warn of funny behavior in some of their
replacement chips.

The NJR13600 / 13700 in particular do not have as wide a common mode
range as the National Semi versions... although they all meet the 5V
specification.

The 4558 is used in a lot of overdrive / clipping apps where phase reversal
could
be a problem.

I have some weird problem in a new design of mine... that clears with a
power
up. That might be the culprit right there (yeah... one of the 45 ICs on that
board
anyway :^)

H^) harry

Bob Weigel wrote:

> Dang...now I'd better go down and get the brand..wait..no better
> check...Ahh JRC4558.  That probably explains it.  I'm recalling ...I
> think a Peavey application where they recommend one 4558 over another in
> something.  It'll come back to me hopefully.  .  -Bob
>
> Harry Bissell Jr wrote:
>
> >  A guy
> >
> >
> >>in AH suggested
> >>that there are some op amps which actually in a
> >>buffer ap will invert
> >>the output when you hit rail!
> >>
> >>
> >
> >Phase reversal.  Some opamps (esp. some Linear Tech)
> >say right on the data sheet "no phase reversal"
> >
> >I had this with OP-07 (no phase reversal) and OP-77
> >(phase reversal). Imagine what this did to a
> >temperature control servo loop. "oops I'm to hot I
> >better turn the heat up EVEN MORE !!!"   :^P
> >
> >
> >I had already tried a
> >
> >
> >>4558 also and this
> >>was the case.  The 1458 is the only amp that works
> >>in that particular
> >>type of applications of the three!  Nice...to know
> >>that! :)
> >>
> >>
> >
> >I have never seen the 4558 phase reverse. I'll be
> >watching for that.
> >
> >H^) harry
> >
> >
> >
> >
> >